also ▁called ▁Ul ug - K hem ) ▁K ante g ir ▁River ▁K hem ch ik ▁River ▁Mal y ▁Y en ise i ▁River ▁( also ▁called ▁Ka - K hem ▁or ▁K aa - K hem ) ▁Upper ▁Y en ise i ▁River ▁( also ▁called ▁Bi y - K hem ▁or ▁B ii - K hem ) ▁ ▁L akes ▁There ▁are ▁numerous ▁la kes ▁in ▁Tu va , ▁many ▁of ▁which ▁are ▁gla cial ▁and ▁salt ▁la kes , ▁including ▁Tod z ha ▁Lake , ▁a . k . a . ▁Az as ▁Lake ▁( 1 0 0   km ² ) ▁– ▁the ▁largest ▁in ▁the ▁republic , ▁and ▁U vs ▁Lake ▁( shared ▁with ▁Mong olia ▁and ▁a ▁World ▁Heritage ▁Site ). ▁ ▁Mountains ▁ ▁The ▁area ▁of ▁the ▁republic ▁is ▁a ▁mountain ▁bas in , ▁about ▁ 6 0 0   m ▁high , ▁enc irc led ▁by ▁the ▁Say an ▁and ▁T ann u - O la ▁ranges . ▁Mountains ▁and ▁hills ▁cover ▁over ▁ 8 0 % ▁of ▁the ▁territory . ▁Mong un - T ay ga ▁(" Sil ver ▁Mountain ", ▁ 3 , 9 7 0   m ) ▁is ▁the ▁highest ▁point ▁in ▁the ▁republic ▁and ▁is ▁named ▁after ▁its ▁gla cier . ▁ ▁Natural ▁resources ▁Major ▁natural ▁min eral ▁resources ▁of ▁Tu va ▁include ▁coal , ▁iron ▁ore , ▁gold , ▁and ▁c ob alt . ▁Fa una ▁include ▁s able , ▁l yn x , ▁wol ver ine ,