Which of the following was not a condition of the berlin conference? the congo could stay in belgian hands. africa would be divided amongst the european nations. most waterways and lakes were neutral areas. slave trade would continue to be allowed.

"Slave trade would continue to be allowed" is the one among the following choices given in the question that was not a condition of the Berlin conference. The correct option among all the options that are given in the question is the fourth option or the last option. I hope that the answer has helped you.

Both countries had to aprove annexation.