18 points total:
8 points: water in D3-D4
6 points: rivers in C3, D3, and D4
3 points: hills in D3
1 point: make the climate in C3, and possibly D4 if I can stretch it, a high rainfall area
coast curves inward in D4 around to the upper left corner of square, and onto D3. coast gently curves downward in D3, forming a gentle hook towards D4, then heads back towards D2, exiting in the upper half of the border of D3 and D2. slightly off shore of the hook is a medium sized Island half in D3 and half in D4. several smaller Island cluster around it. a few more small islands are near the northern shore.
River from C4 continues down in D4 to the the shore. small river flows to the sea from the east, exiting near the bottom of D4.
Many Many rivers in C3 flowing from the various mountains and places around it, merging into a very large river heading south to D3, where it flows into the sea. another river or 2 merge into this great river in D3 also.
Hills cover the hook and the medium sized island, with a chain of them following the southern shore west from the hook, curving towards the mountains in C2.
almost tempted to draw a map of the shore..