The rivers deposit the sediments brought with them in their area of flow or before merging into the ocean. Generally, the triangular shape created by this process is called Delta. When the location of the delta is seaward and the rivers continue to deposit sediments brought along with them in this delta area, then the size of the delta continues to grow in the sea water due to continuous rise of sea level and deposition of debris. Thus the Delta area, which is constantly changing in size, is called the extended delta.
