Logic Masters Deutschland e.V.

Whoever made this map has no idea how contour lines work. Can you work out the terrain elevation using the other features?

Rules:

Normal sudoku rules apply.

Digits represent the elevation of their cell.

Rivers: Digits strictly decrease along a river as it flows from one end to the other. Waterfalls form between digits on a river with a difference of at least 3. All waterfalls are given, marked (≈) on the map.

Trig points: A cell is prominent if it is higher than all neighbouring cells (including its diagonals). All prominent cells are given, marked (◬) on the map.

SudokuPad link

Enjoy!