The phrase "excellent sightlines" means that there is a clear and unobstructed view of something from a certain viewpoint, allowing you to see everything easily.
Sentences with «excellent sightlines»
The boat was comfortable and modern, with excellent sightlines from inside and on the decks. (stubbs-island.com)
The performance space offers excellent sightlines and exquisite sound from every seat. (visittemeculavalley.com)