The Zonama Sekot sim was built on a lagoon, around a big lake. One of the reason was the openspace sim had half the prim quota then now, at the time of the built. After having more prims and removed unused structures, it was time to improve the area. With time, the forest became more dense, the builts more detailed, and the ground area increased.
Things gones progressively.The inside banks was slowy enlarged, The waterfall was continued to a river, a bamboo forest grew on its sides. Then, a dam was built along the bank, the ground level lifted, only the river flew lazyly, and the vegeation grew, to build the swamp is it's now.
In Character, Salene improved since a while her relationship with the plants of Zonama Sekot, and helps them to grow faster.