681
Tens of thousands of destitute Africans try to enter Spain illegally each year by crossing the perilous Strait of Gibraltar to reach the southern mainland or by sailing northwest to the Canary Islands out in the Atlantic .
 thousands: artifact; Spain: destination
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: transport 
  Option: victim, artifact, destination, place, origin, vehicle, agent 
Text: {0} 
Answer:
 thousands: artifact; Spain: destination