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It is the wettest and has a more spread out and more regular rainfall. The average annual temperature is 24 ° 25. The mountainous terrain of average altitude between 600 and 800m is rugged, consisting of hills, steep slopes, plains and lowlands. The Mount Nimba Lola are the highlights of Guinea. Rainfall varies between 1 750-2 500mm with 7 to 8 months of rain. The floors are a combination of various lateritic soils, alluvial, gravionnaires, squeletiques and unsophisticated. Rivers like the Makona, Diani, Oulé, Lofa

The Fouta Jalon includes primary solid Guinean, he separated the Guinea Maritime Upper Guinea. The climate is moderated by altitude that varies between 400 and 1 000m. the average annual temperature is 21 ° 85. The relief is characterized by vast plateaus ending in the west and south by a steep first overlooking the coastal plain. To the east by plateaus that lower towards the savannah plains of Upper Guinea. The highest mountains are Mount Loura in Mali and Mount Tinka in Dalaba. The soils are waterlogged and ferallitique squelletiques. The Fouta is the castle of water in West Africa. The Gambia, Bafing, Konkouré etc. have their source. The rainy season lasts 6 months with 2 500mm 2 000mm south and north to the border of Senegal (Balaki P. Mali)

It is located in the northwestern part on the border of Senegal and Guinea Bissau. The average annual temperature is 28 ° 49. The relief is fairly homogeneous. It features large flood plains in the north and areas often Relief curacées south. The altitude varies from 100 to 400m; the area is watered by the great rivers: Tominé, Komba, Koliba etc. The associations are ferralutiques soil waterlogged, skeletal and alluvial. The rainy season is shorter in the north (Koundara 1 250mm) with 4 months of rainfall, average Gaoual (1 380mm) with 5 months of rain.

The area squarely in eastern Guinea and the reputation of being the least densely occupied the country. The annual average temperature is 26 ° 47. Altitude ranging from 3000 to 460m, is relatively low and tends to rise towards the South. As in the above Niger, the mountains are not numerous; Mention may be made didi Mountains in Siguiri and Kankan koumbakourou. soils are type squeletique ferralitique unsophisticated, hydromorphic and alluvial, low pluviométri The North East of 1200mm area reaches 1800 - 2000mm in the limit of preforest area The area is known for the extent of the plains bordering on large rivers like the Niger, Sankarani Milo, the trusted, etc.

The Upper Niger is a transition region at the foothills east of the Fouta Jalon. The altitude ranges between 300 and 480m. the average annual temperature is 26 °. The terrain is relatively low and monotonous. The mountains are neither numerous nor high (Balayan, Oursa in Dabola. The floors are kind skeletal ferralitique, ferralitique little évolués- hydromorphic and alluvial. The rainfall between 200mm and 1 4 months of rain in the north (Banora) and 2 000mm with 6 months of rain in south trays Solima and Sankaran Niger's tributaries. Tinkisso, Mafour including water the area.

It locates between the Fouta Jalon and the coastal area. It is still under maritime influence. The altitude varies from 220 to 1 000m. the average annual temperature is 25 ° 19. The main rivers are the Kolenté the samou the kakrima. Mount Gangan (Kindia) is the highest peak. The relief is more hectic, accifdenté. Many rivers take their source in the Fouta through the area to the coast. Availability in soil are rare and localized. The floors are squelletiques various outcrop curassés (bowe north) hydromorphe along the rivers, and slightly evolved erosion soils. The rainfall varies from 2 000 to 3 000 mm per year and lasts 6 months.

The preforest area also constitutes a transition zone between the East and the South of Guinea. The average annual temperature is 25 ° 12. Altitude generally 500 to 1 000m reaches 1 219m on the edge of Beyla Kissidougou. The Simandou lies in Beyla. The rains are more abundant. It records a year 1500 to 1 750mm in Beyla, 2 500mm in southern Kissidougou with a dry season from 5 to 6 months. The soils of lateritic type associations and various aluvio suelettique, aluvio and hydromorphic. The area is watered by the Birimba the djion the GBE.

Consisting of a long fringe of mangrove along the Atlantic, notched many rivers (Konkouré, Fatala, melakouré, etc.) and surrounded by more or less wide limited by the foothills of Fouta Jalon plains. The altitude ranges from 0 to 220m and rises progressively with distance from the coast. The annual average temperature is 26 ° 10. The terrain is slightly hilly with many estuaries. Mountains and Kakoulima benna dominate the area. The floors are of type alluvio- fluviomarins, ferallitiques, gravionnaires, waterlogged, deep and skeletal; the area is well watered, the rainfall ranges from 3 000 to 3 500 mm per year in the south (Benty) and mangroves. With 5 - 6 months of rain decreases northwards 2 000-3 000mm and 5 months of rain (Sansalé).