Jamieson, Fausset and Brown on Mark 5:21

21. And when Jesus was passed over again by ship unto the other side--from the Gadarene side of the lake, where He had parted with the healed demoniac, to the west side, at Capernaum.

much people gathered unto him--who "gladly received Him; for they were all waiting for Him" (Lu 8:40). The abundant teaching earlier that day (Mr 4:1, &c., and Mt 13:1-58) had only whetted the people's appetite: and disappointed, as would seem, that He had left them in the evening to cross the lake, they remain hanging about the beach, having got a hint, probably through some of His disciples, that He would be back the same evening. Perhaps they witnessed at a distance the sudden calming of the tempest. The tide of our Lord's popularity was now fast rising.

and he was nigh unto the sea.