Elevation: Mapzen / Tilezen terrain tiles, hosted by the AWS Open Data program.
https://registry.opendata.aws/terrain-tiles/
https://github.com/tilezen/joerd/blob/master/docs/attribution.md

ArcticDEM terrain data DEM(s) were created from DigitalGlobe, Inc., imagery and funded under National Science Foundation awards 1043681, 1559691, and 1542736.
Australia terrain data © Commonwealth of Australia (Geoscience Australia) 2017.
Austria terrain data © offene Daten Österreichs – Digitales Geländemodell (DGM) Österreich.
Canada terrain data contains information licensed under the Open Government Licence – Canada.
Europe terrain data produced using Copernicus data and information funded by the European Union - EU-DEM layers.
Global ETOPO1 terrain data U.S. National Oceanic and Atmospheric Administration.
Mexico terrain data source: INEGI, Continental relief, 2016.
New Zealand terrain data Copyright 2011 Crown copyright (c) Land Information New Zealand and the New Zealand Government (All rights reserved).
Norway terrain data © Kartverket.
United Kingdom terrain data © Environment Agency copyright and/or database right 2015. All rights reserved.
United States 3DEP (formerly NED) and global GMTED2010 and SRTM terrain data courtesy of the U.S. Geological Survey.

Modifications: Terrarium zoom-3 elevation tiles mosaicked locally and quantized to 10-metre increments for compression. Runtime clamps bathymetry, exaggerates positive land relief, caps height at 1.25 scene units, adds a coastal shelf, and simplifies rendered geometry. Data are not suitable for navigation. Web Mercator lacks data above 85.0511 degrees latitude; polar caps use a level land shelf.

Coastlines: Made with Natural Earth. Public-domain 1:50m Admin 0 countries.
https://www.naturalearthdata.com/about/terms-of-use/

Capital cities: Made with Natural Earth. Public-domain 1:10m populated places,
filtered to adm0cap = 1 (national capitals as designated by this dataset).
https://github.com/nvkelso/natural-earth-vector/blob/master/geojson/ne_10m_populated_places_simple.geojson
Names, capital designations, and disputed territories follow the source dataset;
this is an illustrative map, not an authoritative political or navigation reference.

Place search: Photon geocoding service by Komoot, using OpenStreetMap data.
https://photon.komoot.io/
https://www.openstreetmap.org/copyright

Grass and foam-water tiles: original artwork created for this project.