NET

23 And after he sent the crowds away, he went up the mountain by himself to pray. When evening came, he was there alone.

Darby

23 And having dismissed the crowds, he went up into the mountain^D6784 apart to pray. And when even was come, he was alone there,

Darby Bible Notes

mountain - Here, as noticed already, 'the mountain' is in contrast with the plain, so of 'the ship.' It is not 'a mountain,' but he left the low ground by the sea and went up. see Note, ch. 4.21.

KJV

23 And when he had sent the multitudes away, he went up into a mountain apart to pray: and when the evening was come, he was there alone.