Building a basin in one piece with the Land and Sea Relief Map preset

Open the Land and Sea Relief Map preset. It loads on Lake Tahoe at zoom ~10.2 in a square (1:1) frame, which holds the whole lake plus the ring of mountains around it. When you move it, look for a basin where steep terrain meets deep water: a single lake or fjord in frame works best, so the contour stack and the depth bands both have room to read. If you change location, check the preview and retune the elevation and depth values for your basin (see Step 2).

Top to bottom, three layer groups stack into one basin:

• Topography - an all-bands elevation contour stack for the mountains around the lake. Each band becomes a raised tier in the stack, so the terrain steps up the higher it climbs. If your basin sits at a different altitude than Tahoe's high alpine ring, retune the band values to bracket your surrounding peaks, and delete any empty bands.
• Lake depth - a bathymetry group with the water cut as holes, so each band is a plate with the deeper water removed and the lake bed steps down toward the backplate. The bands run from a deep teal #2F6F8F at the bottom band up to a pale #C0E4E8 at the shallowest band. Depth comes from a modeled approximation by default, with real charted surveys for a growing set of major water bodies, so you can pick Simplified or Advanced when you add the layer. Coverage varies; if the bands look flat for your lake, pick a larger or better-surveyed basin nearby.
• Backplate - #1f2937 solid slate, the floor the whole basin sits on and the lake's deepest point.

The land relief and the lake depth are tuned to meet at the shoreline, so the contour tiers and the depth bands line up at the water's edge. Keep the water cut as holes on the depth group so the bands export as stepped plates rather than solid water blobs.

• Laser: per-layer SVG ZIP - one plate per contour tier and one per depth band, plus the backplate. Run small-polygon cleanup, since a full basin at this zoom produces slivers. Keep the inversion toggle on so the depth bands export as stepped plates.
• 3D printing: 3MF carries the teal depth ramp and terrain colours as a single merged relief; STL gives a one-material model you can wash with colour afterwards.

• Strong candidates: deep lakes and crater basins like Crater Lake, Lake Geneva and Lake Como, plus the Norwegian fjords - any place where steep land drops straight into deep water.
• Retune the Topography bands to your basin's altitude - high and tight for an alpine crater, low and broad for a coastal fjord.
• Swap the teal depth ramp for icy blues (#1E3A5F deep to #D6ECF5 shallow) for a colder northern-lake feel.
• Cut the depth bands from successively darker teal acrylics and skip painting entirely, letting the colour itself read the depth.
• Add or remove layers to control the look: more contour tiers and depth bands give a finer, more sculptural relief, while fewer give a bolder, graphic step.
• Mark the family cabin, a favourite cove or a summit with heart icons on the top tier.
• 3MF plus clear PLA for the lake depth bands gives a genuinely watery basin you can almost see into.