爬山涉水

páshānshèshuǐ
to climb mountains and wade rivers (idiom); fig. to make a long and difficult journey

CEDICT

Entry Composition

1 爬山 páshān to go for a hike (esp. in the hills or mountains)
2 涉水 shèshuǐ
  1. (literary) to cross over a body of water in a shallow area; to wade
  2. to cross over a body of water in a shallow area; to wade