<prompt> Translate the following text to SwahiliThe winding channel is 30 km 18 miles long and about 2 km 11.2 miles wide, narrowing to 750 metres 2,250 feet at Rumeli Hisare.  <response>: Mfereji huo una urefu wa kilomita 30 na upana wa kilomita 2 na unazidi kupungua hadi mita 750 huko Rumeli Hisare. 