▁after ▁I ror ▁Er re ge ▁Ma ia ▁and ▁E uz kar re ▁among ▁others , ▁all ▁of ▁them ▁in ▁Navar re . ▁Also ▁in ▁the ▁high lands ▁are ▁located ▁the ▁O ts og or rig ain a ▁( 1 , 9 2 2 ▁m ) ▁and ▁Sar dek ag ain a ▁( 1 , 8 9 3 ▁m ), ▁which ▁are ▁the ▁second ▁and ▁third ▁highest ▁mountains ▁in ▁Sou le . ▁In ▁total , ▁there ▁exist ▁more ▁than ▁ 2 0 ▁pe aks ▁higher ▁than ▁ 1 , 0 0 0 ▁m . ▁ ▁H ydro graph y ▁▁ ▁The ▁river ▁Saison ▁( known ▁as ▁Ü h ait za ▁in ▁Sou letin ▁Bas que ) ▁is ▁the ▁main ▁river ▁of ▁Sou le . ▁It ▁is ▁ 6 0   km ▁long ▁and ▁origin ates ▁at ▁Lic q , ▁in ▁the ▁high lands ▁region . ▁Sm aller ▁rivers ▁rising ▁at ▁the ▁Py ren ees ▁join ▁the ▁Saison ▁before ▁it ▁converges ▁with ▁the ▁river ▁O lor on , ▁together ▁flow ing ▁into ▁the ▁river ▁Ad our . ▁ ▁Cl imate ▁▁ ▁The ▁ocean ic ▁climate ▁of ▁Sou le ▁is ▁generally ▁warm ▁and ▁hum id . ▁The ▁high lands ▁and ▁Py ren ees ▁experience ▁an ▁al pine ▁climate . ▁ ▁Dem ography ▁▁ ▁Sou le ▁is ▁the ▁province ▁with ▁the ▁lowest ▁population ▁density ▁of ▁the ▁Northern ▁Bas que ▁Country , ▁with ▁ 1 7 ▁people ▁per ▁square ▁kilometer . ▁Sou le ▁has ▁experienced ▁a ▁significant ▁population ▁decl ine ▁since ▁the ▁ 1 9 th ▁century