<prompt> Translate the following text to EnglishMji huo ulikuwa mpaka wa kale wa Nubia upande wa kusini na ulikuwa njia ya biashara ya ngamia kwa bidhaa za Kiafrika kama vile dhahabu, pembe za tembo, na vikolezo.  <response>: It marked the ancient border with Nubia to the south and was the conduit for the camel caravan trade in African products such as gold, ivory, and spices. 