Kukho umda obaluleke kakhulu eDenmark, kuba yahlula iJutland Peninsula neSweden ukongeza ekujoyineni uLwandle lweBaltic kunye noLwandle lwaseMantla. Ithiyiwe Umgaqo weKattegat kwaye yi-220 km ubude. Kukho inani elikhulu leziqithi elinokuthi libonwe ecaleni kwendlela, nangona iSamso, iLaeso kunye neAnholt zezona zikhulu.
Igama le-strait livela kumagama amabini amaDatshi. Inye ngu "kat" kwaye ithetha ikati, ngelixa enye ingu "gat" eguqulela emngxunyeni. Ukuqonda ukuba kutheni eli gama kufuneka sibuyele kwi-Middle Ages. Kuthiwa ngala maxesha kwakunzima kakhulu ukuhamba emanzini, kuba ukumxinwa (kakhulu kangangokuba ngamanye amaxesha kuthathwa njenge-bay) ukwakheka kweebhanki zesanti kwakuqhelekile.
Njengoko besesitshilo, uKattegat uzalisekisa umsebenzi obalulekileyo, ukusukela Yahlula izizwe ezimbini, eDenmark naseSweden. I "International Hydrographic Organisation" (IHO), elilelona gunya liphezulu kwihlabathi xa kufikwa ekubekeni imida yolwandle, ithatha le ngxaki njengolunye lolwandle kwaye iyinika inombolo yesi-2 njengesazisi.