Channel Islands Harbor is a combined shore-protection project and small craft harbor located at the southern end of the Santa Barbara Channel in Oxnard, California. It is the fifth largest harbor for small-craft recreation in the state of California and is a waterfront resort, recreation, and dining marketplace. Recreational activities include diving, boat charters, sea kayaking, sportfishing, and whale watching (gray whales January through early April; blue and humpback whales July to September).