This map shows the various islands around Tahiti and Bora Bora. I don't believe the distances are at the same scale as the islands themselves. The distance from Tahiti to Bora-Bora is about 150 miles.
The map below shows the island of Bora-Bora. We stayed at Le Meridien on the motu (Motu is "small island" in Tahitian) east of the main island which is only accessible by boat.
Map of Bora-Bora
An Air Tahiti plane (ATR-72?) like the one we took from Tahiti to Bora Bora
Our first view of the main island of Bora Bora from the airport.