This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: Due to the Ottoman slave trade that had flourished in the Balkans, the coastal town of Ulcinj in Montenegro had its own black community. As a consequence of the slave trade and privateer activity, it is told how until 1878 in Ulcinj 100 black people lived. The Ottoman Army also deployed an estimated 30,000 Black African troops and cavalrymen to its expedition in Hungary during the Austro-Turkish War of 171618. Question: Where did the Ottoman slave trade flourish?
in the Balkans