Dar-al-Rashid
Home of the Mad Mamluks space marine chapter and The Order of the Pointed Word
Dar-al-Rashid is a desert planet with numerous oceans, The space marines staying mainly in the deserts while the order of the pointed word spends their time on the coasts.
All in all, it's not too terribly grimdark, especially if you enjoy busting surfboards.
The Planet Itself
Coastal Regions
Inland Desert
A Brief History of Dulichium Dar-al-Rashid
Military Forces of Dar-al-Rashid
Dulichium Hoplites
Samiel Militia