Modifiers matching terrain:

• diverse,
• dangerous,
• open,
• varied,
• barren,
• irregular,
• rough,
• hazardous,
• uneven,
• flat,
• unstable,
• broad,
• rugged,
• grassy,
• regular,
• over,
• sensitive,
• difficult,
• large,
• homogeneous,
• geophysical,
• complex,
• exciting,
• featureless,

Simple categories matching barren:

• ground,
• area,
• terrain,
• land,
• rock,
• environment,
• mineral,
• community,