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Generally flat with little flat land. Most of the plains and foothills. And coastal areas. The coastal plain is usually low. Area east of the island of Sumatra. And north of the island of Java.In addition, it has a coastal area of ​​the island of Kalimantan. And e-learning Jaya island
.Rivers and lakes. Because the Indonesian archipelago. In the monsoon rain throughout the year. The area is mostly mountainous. Thus causing the river. And the lake on the island of many rivers and lakes are important for the question
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Plains In General, there is less fertile areas, mainly around the Hill and Plains along the sea coast. The coastal plains are often low. On the East of North Sumatra and Java And in addition, it has a coast of Kalimantan island and Koh e learning Jaya
. River and Lake Islands in Indonesia due to the monsoon zone, so there is rain throughout the year, and most of the areas are mountains, thus causing the river and the Lake are numerous on the island. The river and the Lake for khatan:

The area is generally flat plain at least mostly in the plain area of the hill and the sea coast the coast is often a low plain area in the east of the island of Sumatra, where the northern and Javaand, in addition, it is the coast of the island at night, it was an e-learning and the island, Jacob
the river and the Sea Islands, Indonesia, curse because it is in the area of monsoon climate, with heavy rain throughout the year and most of the area is mountainous and therefore cause the river and the sea is cursed on the island, the river and the lake located internally, including the Main and only difference with budget