The Proto-Turkic word *alan
Word *alan
Meaning level ground, plain
See also Proto-Altaic: *pʰāla ‘field, level ground’

Other words that might be of interest
*jalaŋ ‘field, steppe’, *jẹr ‘earth, land’, *topra-k ‘earth, soil’, *dāg ‘mountain’, *orman ‘forest’, *jüg- ‘upwards, to rise, hill, high’, *buruk- ‘dust, soot’, *bạl- ‘mud, clay’