AT least 300 people who were travelling on three migrant boats from Senegal to Spain's Canary Islands have disappeared, migrant aid group Walking Borders said. Two boats, one carrying about 65 people and the other with between 50 and 60 on board, have been missing for 15 days since they left Senegal to try to reach Spain, Helena Maleno of Walking Borders told Reuters. A third boat left Senegal on June 27 with about 200 people aboard. The families of those on board have not heard from them since they left, Maleno said. All three boats left Kafountine in the…