Mobile Ad Hoc Networks (MANETs) use anonymous routing protocols that hide node identities and/or routes from outside observers in order to provide anonymity protection. However, existing anonymous routing protocols relying on either hop-by-hop encryption or redundant traffic, either incurs high cost or cannot provide full anonymity protection to data sources, destinations, and routes. The high cost adds to the inherent resource constraint problem in MANETs especially in multimedia wireless applications. To offer high anonymity protection at a low cost, Anonymous Location-based Efficient Routing protocol (ALERT) is proposed. ALERT partitions the network field into zones and randomly chooses nodes in zones as intermediate relay nodes, which form a non-traceable anonymous route and offers anonymity protection to sources, destinations, and routes.