A more thorough explanation:

Definition: Delivered at frontier is a term used in mercantile-contracts that outlines the responsibilities of the buyer and seller of goods in terms of delivery, payment, and risk of loss. The seller is responsible for clearing the goods for export, arranging and paying for transportation, and delivering the goods to a specified place on the importing nation's border. The seller's delivery is complete when the goods arrive at the designated point and are placed at the disposal of the buyer.

Example: A company in the United States wants to purchase goods from a company in Canada. The two companies agree to use the delivered at frontier term in their contract. The Canadian company is responsible for clearing the goods for export, arranging and paying for transportation, and delivering the goods to a specified place on the U.S.-Canada border. Once the goods arrive at the border and are placed at the disposal of the U.S. company, the delivery is complete, and the risk of loss passes to the U.S. company.

Explanation: This example illustrates how the delivered at frontier term works in a real-world scenario. The Canadian company is responsible for all aspects of the delivery until the goods arrive at the U.S.-Canada border. Once the goods are at the border, the U.S. company takes over responsibility for the goods, and the risk of loss passes to them. This term is commonly used when the delivery place is on land, but it does not specify the mode of carriage.