Why are they shaped liked the way they are?
Well, these are called tetra-pods and they serve a purpose.
So, when the roaring waves travel till this boundary, a portion of its energy is absorbed by the rocks.
Although, sometimes criticized for affecting the scenic beauty, they are quite popular in Japan.
Bombay is not the only place to have them. Places around the world use them to serve the same purpose.
Even Mount Fuji is surrounded by concrete tetra-pods lining the shore of Suruga Bay, Miho no Matsubara.
They are also present at the North Sea in Germany.
Lithuania, a former Soviet bloc nation is Europe's Southernmost Baltic state, is also surrounded by these
