Nicaragua divides in three different Regions
The Pacific lowland extends around 80 km inland from the coast. It’s flatland, except for a couple of new volcanoes, some are still active.
In this area we find the largest freshwater lakes in Central America. The lake of Managua (Lago de Managua) and the lake pf Nicaragua (Lago de Nicaragua).
The valley of the Río San Juan forms a natural passage across the Nicaraguan isthmus from the Caribbean until the lake of Nicaragua.
The area called central highlands is composed of up to 1800 m over sea level. You will not find any important rivers flowing west to the Pacific. North of Managua the mountains sweep up from sea level in a combination of hillsides, coffee-plantations and pasture, until the border to Honduras and east to the jungles of the interior of Nicaragua.
The eastern Caribbean lowlands of Nicaragua form the extensive and still sparsely settled lowland area with the inviting name of “Costa de Mosquitos”. The Caribbean lowlands are occupying nearly 50% of Nicaragua's territory, but only very few people live there. .
It is a a hot, humid area that includes coastal plains, the eastern spurs of the central highlands, and the estuary of the Río San Juan.