It runs southwest through the community of Penobsquis; several tributaries join the river in the town of Sussex several kilometres further west.
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Several large islands can be found in the river, such as Kennebecasis Island just off-shore from Summerville on the Kingston Peninsula, and uninhabited (with the exception of a few summer cottages & an Off The Grid Community on the southern part of the island) Long Island, located near Rothesay.
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Southwest of Sussex, the river becomes increasingly larger as it passes the communities of Norton and Hampton, before it empties into a delta-like area informally called the Hampton Marsh.
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The communities of Nauwigewauk, Quispamsis and Rothesay become increasingly urban as the river approaches its junction with the Saint John River.
Millidgeville is situated on the northern edge of the city, on Brothers Cove off the Kennebecasis River at the point where that westerly flowing river meets the southerly flowing Saint John River.
On January 1, 1998 the village was merged with several other communities situated along the lower Kennebecasis River to become part of an expanded town of Rothesay.
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It is named after James Renforth, a rower from Britain who had died of heart failure during a match against Saint John's famous Paris Crew in August 1870 in the waters of the Kennebecasis River off the community.