The San Juan river, is a very importan way of admittance for the interior of the country since colonization times and has been witness of many historical events. It has also been goingto become an intraoceanic channel thanks to the thin land stripe that divides the Lake of Nicaragua from Pacific Ocean;only in the end Panama was preferred to it.
The San Juan river hows for 200 Km carrying waters of the Cocibolca lake until the Caribbean sea. In some places the river hows wide, in others the capacity returns whirly.
Somewere you can mets small islands covereds with a luxuriant vegetation. From the lake until the Castillo country the river is wide and some people live on the shores, going towards the sea the water becomes more whirling and the shores become wild and solitary.
From the affluent confluence, the Saint Carlos river, until the biforcation, the river becomes wide and majestic with several rectilinear features coasted by tropical forest (Indian reserv Maiz). 25 Km before its outlet in the Carribe the river divides in more coppers originating a marshy delta where there are numerous lagoons, the main one is the lagoon of Saint Juan del Norte anciently called Gretown Bay.