Somebody has been camped at the tarn for a while. It is a small round water in a clearing the pines have left round it. The camp is on the west bank, where the ground has been trodden bare: three tents with their mouths to the fire, a ring of stones with the embers still in it, a split log to sit on, a blanket left out, a sawn round they use for a table. They have been cutting their own wood - there are fresh stumps along the edge of the trees, and boards stacked by the tents - and they have a boat, tied to a post on the near side of the water. A path comes in through the trees from the west and stops at the fire. The far bank is untouched.
A clearing with two things in it side by side: the camp on the west and the water on the east, a strip of grass between them. Inside the camp everything is arranged round the fire. Trees ring the clearing and are thickest at the map edge; the stumps are where the ring has been eaten into, on the camp side only.
40 x 30 squares. The tarn fills cols 21-33, rows 8-20, thirteen by thirteen, with its corners stepped in: five squares wide on the top and bottom rows, nine on the next, eleven for two rows, and the full thirteen for the five in the middle. Every step is at least two squares long, which is what an inside corner needs. The trodden patch is roughly cols 7-18, rows 12-20, with its edge kept two squares short of the water so there is a bank. The fire is at cols 12-13, rows 15-16. The tents stand north of it with their door rows on rows 12 and 13 - a tent's mouth is its bottom edge, so "mouths to the fire" puts all three above it, in a shallow arc, the middle one a row further back. The seat is south of the fire on row 18. The path is rows 16-17 from the west edge. The boat is at cols 22-23, row 14: col 21 is the bank. Stumps are on the north-west and south-west of the patch, between it and the pines.

Read this against the paragraph at the top. That comparison is the only check that catches a map which is perfectly valid and is of nowhere.

The same two grids as flat colour — earth, grass, and a block for every footprint. Anything in the render that is not here, the translation invented.
....YYYY.......YYYY.......YYYY.......... ..........NNNN..................NNNN.... NNNN..........tt......NNNN.............. ....................tt.................. .....NNNN.......NNNN...........YYYY.NNNN ..tt.....YYYY..............NNNN......... ....................nnnntt........tt.... .............++...ss.................... NNNN.................................... .....**............................NNNN. ...........DDD.......................... .......TTT.DDD.TTT....................tt ..++...TTT.DDD.TTT...................... ss...ppTTT.....TTTb..................... ...............b......BB............NNNN ............FF........i................. ............FF..KK...................... ................KK....................tt ........SS.LLL.......................... .++.....SS.........................NNNN. ....++.................................. ........................................ ...tt....++...**..................tt.... nnnn.............tt..YYYYNNNN.YYYY..nnnn .....NNNN......................NNNN..... ............NNNN...NNNN................. .............................tt......... NNNN..tt..............YYYY..........NNNN ........nnnn....YYYY........nnnn........ ........................................
| 24 | tree_pine | tree living conifer large |
| 12 | tree_small_dark | tree living small conifer |
| 9 | tree_green | tree living broadleaf large |
| 5 | stump_cut | prop stump felled |
| 2 | tree_small | tree living small |
| 2 | stump | prop stump |
| 2 | tent | structure tent camp doorway |
| 2 | barrel | prop goods barrel |
| 1 | tent_dark | structure tent camp doorway |
| 1 | planks | prop timber |
| 1 | boat | prop boat |
| 1 | firepit | prop fire camp |
| 1 | mooring_post | prop post boat |
| 1 | blanket | prop cloth camp |
| 1 | stump_table | prop table camp |
| 1 | bench_log | prop seat camp |