Geography of the Gambia careful surveying methods by the Franco-British boundary commission. Apart from its coastline, where the Gambia borders the Atlantic Ocean, it is an enclave of Senegal and is by far the smallest country on mainland Africa. The Gambia has a subtropical climate with distinct dry and rainy seasons. From November to mid-May there is uninterrupted dry weather, with temperatures as low as in Banjul and surrounding areas. Hot, humid weather predominates the rest of the year, with a rainy season from June to October; during this period, temperatures may rise as high as but are usually lower near the sea. Mean
Wildlife of the Gambia angolensis)", crakes, greater painted snipe "(Rostratula benghalensis)" and African jacana (Actophilornis africanus). Butterfly faunal distribution in the Gambia is dictated by the boundary of two major biomes of Sahelian and Guinean Savanna species; it is distinctly different between the rainy season and dry season. The vegetation of the Gambia is mostly savanna in the upland areas, inland swamp in the low-lying areas, and mangrove swamp along the banks of the lower Gambia River. The country is almost devoid of true forest cover, the most forested area being the Bijo Forest. Nonetheless it is biologically rich, with an estimated 11,600 plant