{Sat in the sea} (kath(8873)thai en t(8869) thalass(8869)). In the
boat, of course, which was in the sea. He first sat by the beach
( Mt 13:1 ) and then a very great multitude (ochlos pleistos)
made him enter a boat in which he sat and taught. It was a common
experience now to teach the crowds on the beach ( 2:1,13  3:7-9 ). {There is gathered} (sunagetai). Graphic pictorial
present again. See the crowds pressing Jesus into the sea.