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What exactly does "additional landings" mean here. I usually think of a cable as connecting two places.

Is it basically multiple cables that connect to the same exchange onshore?

Or is there a router "at sea" where the cables fork?

Or does some of the cable from the US terminates in Brazil, some terminate in Punta del Este, ...

Depends on the cable. In some cases, the fiber bundle will be fully terminated at the landing, which serves as a junction point where the logical path for the cable system then resumes via a different cable to the next landing in the path. In other cases, a fraction of the fiber bundle will be split (either physically or with a subsea multiplexer device) and directed to a nearby landing, with the remainder of the fiber continuing onwards.

On these newer cables they tend to use wavelength-selective switches at BUs.

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