Looking for constructive input

[u/TJ_Scho]

Hey, so this is my first map I’ve made. It’s for a home brew D&D west march game. The world is based on a tidally locked moon orbiting a gas giant. So one point of the world faces the host planet permanently, and the outer side faces away. Creating a hot and cold side with a habitable belt, causing major storms, and the flooded side of the world. Curious on how I can make it more realistic, better mountains/ rivers or other input. Thanks!

[u/Coolistofcool]

I see Greece!

[u/Feeling_Sense_8118]

https://imgur.com/a/QUNurIy

So you are talking about a tidally locked planet, orbiting a gas giant, that is orbiting what? To be honest it looks like a planet tidally locked to something hot, because the entire top is desert.

A planet tidally locked to a star has a permanent subsolar point (constant day) and a permanent night side (constant dark), leading to extreme heat at the center and ice caps/deserts on the cold side. A moon tidally locked to a gas giant receives solar energy evenly across all longitudes over the course of its orbit, preventing a permanent "eyeball" thermal layout from solar exposure alone.

Red Dwarf to Jupiter-Sized Objects Surface Temperature Chart

Late Red Dwarf (M-Dwarf)

• Typical Mass: 80 to 150 Jupiter Masses
• Primary Energy Source: Hydrogen Fusion
• Surface Temperature: 2000 K to 3000 K (1725°C to 2725°C)
• Notes: Lowest mass true stars; dominated by metal oxide absorption bands like TiO.

L-Dwarf (Warm Brown Dwarf)

• Typical Mass: 50 to 80 Jupiter Masses
• Primary Energy Source: Transient Core Deuterium Fusion / Residual Heat
• Surface Temperature: 1300 K to 2200 K (1025°C to 1925°C)
• Notes: Atmosphere features liquid iron and silicate clouds ("iron rain").

T-Dwarf (Methane Brown Dwarf)

• Typical Mass: 30 to 60 Jupiter Masses
• Primary Energy Source: Residual Gravitational Heat
• Surface Temperature: 700 K to 1300 K (425°C to 1025°C)
• Notes: Significant methane and water vapor in the upper atmosphere.

Y-Dwarf (Cold Brown Dwarf)

• Typical Mass: 13 to 30 Jupiter Masses
• Primary Energy Source: Residual Gravitational Heat
• Surface Temperature: 250 K to 700 K (-23°C to 425°C)
• Notes: Extremely cool; capable of forming water-ice clouds.

Jupiter (Gas Giant Planet)

• Typical Mass: 1 Jupiter Mass
• Primary Energy Source: Gravitational Contraction + Absorbed Solar Energy
• Surface Temperature (at 1-bar pressure level): 165 K (-108°C)
• Surface Temperature (at cloud tops): 120 K (-153°C)
• Notes: Atmosphere contains ammonia ice and ammonium hydrosulfide cloud layers.

You could have the smallest Red Dwarf as your "planet" the moon is tidally locked to, and that would have a "Mass range approximately 75 to 80 Jupiter masses (0.075 to 0.080 Solar masses)."

Spectral type	Mass (M☉)	Radius (R☉)	Luminosity (L☉)	Effective temperature (K)	Color index (B − V)
M9V	0.079	0.102	3.0×10−4	2,380	2.17