Geography
Mahe, also known as Mayyazhi, is a small region of the Union Territory of Puducherry situated on the Malabar Coast of Kerala. Geographically, it is surrounded by the State of Kerala and lies on the western coast of the Indian Peninsula, between Vadakara (Badagara) and Thalassery. Mahe town is situated near the mouth of the Mayyazhi (Mahe) River, where the river meets the Arabian Sea.
The region has a total area of approximately 9 square kilometres (868.76 hectares). Despite its small geographical extent, Mahe has a distinctive geographical setting, characterised by its coastal location, river systems, low and moderately elevated hills, lateritic terrain and close association with the surrounding landscape of northern Kerala.
Mahe is geographically separated from the main territory of Puducherry and is located approximately 630 kilometres from Puducherry. The region forms a small but distinct enclave of the Union Territory of Puducherry within Kerala.
Geographical Coordinates
- Latitude: 11°42′ to 11°43′ North
- Longitude: 75°31′ to 75°33′ East
- Area: Approximately 9 sq. km.
- Coastline: Approximately 5 km
The geographical coordinates and area are consistent across official Puducherry and Mahe government sources.
Boundaries and Location
Mahe is bounded by the following geographical features:
- West: Arabian Sea
- North: Ponniyar (Moolakkadavu) River
- Other sides: Areas of the State of Kerala, including the districts of Kannur and Kozhikode
The region is characterised by a combination of coastal areas, riverine landscapes and low to moderately elevated hills. Some of the hills are connected towards the Western Ghats through a series of wooded hillocks.
Mahe town is situated on the southern side of the Mayyazhi River near its junction with the Arabian Sea. The river divides the region into two broad parts as it flows westwards towards the sea.
Neighbouring Districts
Mahe is surrounded by the following districts of Kerala:
- Kannur District
- Kozhikode District
Mahe is therefore geographically located within the Kerala region while administratively forming part of the Union Territory of Puducherry.
Rivers
The principal rivers associated with the Mahe region are:
- Mayyazhi (Mahe) River
- Ponniyar River
The Mayyazhi River is particularly significant to the region as Mahe town is situated near its estuary with the Arabian Sea.
Climate
Mahe has a humid tropical climate characteristic of the Malabar Coast. Its proximity to the Arabian Sea and its location on the western coast of India strongly influence its temperature, rainfall, humidity, wind patterns and seasonal conditions.
The climate is generally warm and humid throughout the year. The period from March to May is relatively hot, while the Southwest Monsoon brings abundant rainfall from around June onwards. December to February is comparatively cooler and drier.
Rainfall
Mahe receives heavy rainfall, principally under the influence of the Southwest Monsoon. Official district sources report average annual rainfall of approximately 3,000 mm, while other official climatological records published by the administration contain higher historical averages. The available official figures therefore vary depending on the reference period and source.
The principal rainy period extends from June to August, when the region receives continuous and substantial rainfall under the Southwest Monsoon. Moderate rainfall may also occur during September and October under the influence of the Northeast Monsoon and associated weather systems.
The heavy rainfall contributes significantly to the region’s lush vegetation, groundwater recharge, agricultural activity and river flow. At the same time, intense monsoon rainfall can result in localised flooding and waterlogging, particularly in low-lying and riverine areas.
General Rainfall Pattern
- Southwest Monsoon: June to August – principal rainy season
- Post-monsoon/Northeast Monsoon influence: September to October
- Relatively dry period: December to February
- Average annual rainfall: Approximately 3,000 mm according to the current district overview
Mahe receives the highest rainfall among the four regions of the Union Territory of Puducherry according to the Agriculture Department’s district information.
Temperature
The climate of Mahe remains warm throughout the year, with seasonal variations influenced by the Arabian Sea and the monsoon.
According to the official district profile, temperatures generally range from approximately 19°C to 36°C depending on the season. The warmer period generally occurs during April and May, while relatively cooler conditions prevail during December to February.
During the Southwest Monsoon, cloud cover and rainfall moderate daytime temperatures. The official climatological description records mean maximum temperatures of around 29°C during the monsoon months, while temperatures rise during April and May, when maximum temperatures can reach around 33°C and occasionally higher on individual days.
The relatively cooler period during winter is not characterised by a pronounced cold season. Night temperatures generally decline from November and reach their lowest levels around January.
Humidity
Humidity remains relatively high throughout the year because of Mahe’s coastal location and proximity to the Arabian Sea.
Relative humidity is generally above 70 percent during much of the period from April to November, while it remains above approximately 60 percent during the remaining months. High humidity, combined with warm temperatures, contributes to the characteristic humid tropical climate of the region.
Cloudiness
Cloud conditions vary according to the season.
During the Southwest Monsoon, the sky is generally heavily clouded to overcast because of persistent monsoon activity. April and May, as well as the retreating/post-monsoon period during October and November, generally experience moderate cloudiness.
During the relatively dry months, skies are generally clear or lightly clouded.
Surface Winds
Surface winds in Mahe are generally moderate throughout the year.
During the monsoon months, winds commonly occur from westerly to north-westerly directions. During other seasons, wind direction varies according to the time of day, with north-easterly to easterly winds commonly experienced during the morning and westerly to north-westerly winds during the evening.
Special Weather Phenomena
Mahe’s location along the Arabian Sea makes it susceptible to weather systems associated with the Arabian Sea and the broader Indian monsoon system.
Storms and depressions developing over the Arabian Sea, particularly during the pre-monsoon period, can influence the onset and progression of the Southwest Monsoon over the region.
Weather systems originating in the Bay of Bengal may also move across peninsular India and emerge over the Arabian Sea, where they can sometimes intensify or influence weather conditions along the west coast.
Associated weather phenomena may include:
- Thunderstorms
- Heavy rainfall
- Strong winds and squalls
- Temporary changes in monsoon intensity
- Localised flooding during periods of intense rainfall
Such conditions are particularly relevant during the pre-monsoon and monsoon/post-monsoon periods.
Topography
Mahe has a varied physical landscape despite its small geographical area.
The region includes:
- Coastal areas along the Arabian Sea
- Riverine and estuarine environments
- Low-lying areas
- Lateritic terrain
- Low and moderately elevated hills
- Small stretches of wooded hillocks
The presence of moderate-height hills is a distinctive feature of the region. The terrain in parts of Mahe is connected geographically towards the Western Ghats through a series of hillocks.
Soil
The soils of Mahe vary according to the geographical setting.
Lateritic soil is predominant in the inner areas of the region, while sandy and coastal soils occur in areas closer to the Arabian Sea.
The lateritic soil and humid tropical climate support a variety of plantation and horticultural crops. Coconut, banana, tapioca, arecanut and pepper are among the major crops cultivated in the region. Fruits such as jackfruit and mango are also commonly grown.
Drainage and Water Bodies
The drainage system of Mahe is closely associated with the Mayyazhi and Ponniyar rivers and the Arabian Sea.
The Mayyazhi River flows westwards towards the Arabian Sea and is an important geographical feature of the region. Its estuary forms a distinctive part of the landscape of Mahe town.
The riverine and coastal environment also contributes to the ecological character of the region and influences settlement patterns, agriculture and local economic activities.
Geology
The first systematic mapping and mineral investigation of Mahe was carried out in 1960. The geological formations identified in the region include both ancient crystalline formations and relatively recent surface deposits.
The principal geological formations recorded for Mahe are:
- Recent and Sub-Recent Laterite and Beach Sand
- Archaean Dolerite Dykes
- Pegmatite Veins
- Biotite Gneiss
- Garnetiferous Pyroxene Granulite
- Amphibolite
These formations reflect the geological diversity of the region and its association with the broader geological framework of the western peninsular part of India.
Vegetation
Mahe has no significant recorded forest area. However, the region contains wooded hillocks, trees associated with settlements and agricultural landscapes, as well as coastal and riverine vegetation.
The warm and humid climate and high rainfall support abundant vegetation, particularly coconut, arecanut, banana, pepper, fruit trees and other horticultural crops.
Agriculture and Natural Environment
The physical environment of Mahe has a direct influence on agriculture. The combination of heavy rainfall, tropical climate, lateritic soils and moderate hill slopes supports plantation and mixed-cropping systems.
Major crops grown in the region include:
- Coconut
- Banana
- Tapioca
- Arecanut
- Pepper
- Vegetables
- Jackfruit
- Mango
- Other fruit and tuber crops
The Agriculture Department identifies tier and mixed cropping systems as characteristic of the region.
Geographical Significance
Mahe occupies a distinctive geographical position within the Union Territory of Puducherry. Although it covers only about 9 square kilometres, it combines a coastal environment, river systems, tropical climate, heavy monsoon rainfall, lateritic terrain and low hill formations within a compact geographical area.
Its location on the Malabar Coast and its physical association with northern Kerala have shaped the region’s environment, settlement pattern, agriculture and economic activities. At the same time, its administrative status as part of the Union Territory of Puducherry gives Mahe a unique geographical and administrative identity.
Key Geographical Facts
| Particular | Details |
|---|---|
| Region | Mahe, Union Territory of Puducherry |
| Location | Malabar Coast, West Coast of India |
| Area | Approximately 9 sq. km. |
| Latitude | 11°42′ to 11°43′ N |
| Longitude | 75°31′ to 75°33′ E |
| Coastline | Approximately 5 km |
| Neighbouring districts | Kannur and Kozhikode, Kerala |
| Major rivers | Mayyazhi (Mahe) River and Ponniyar River |
| Climate | Humid tropical / tropical monsoon |
| Average annual rainfall | Approximately 3,000 mm |
| Principal rainy season | Southwest Monsoon |
| Major monsoon months | June to August |
| Temperature range | Approximately 19°C–36°C |
| Major soil types | Lateritic and sandy/coastal soils |
| Major crops | Coconut, banana, tapioca, arecanut, pepper and fruits |
| Major geological formations | Laterite, beach sand, dolerite dykes, pegmatite, biotite gneiss, garnetiferous pyroxene granulite and amphibolite |
Source: District Administration, Mahe; Agriculture Department, Mahe; Government of Puducherry.