KIBBUTZ NIR DAVID, Israel — A whimsical chain of inflatable rafts tethered together by a flimsy rope floated along the Asi, a gentle stream that runs for a mile through a sunbaked plain in northern Israel.
The boats were packed with residents of the area, their children and day trippers from farther afield, but this was no picnic, even though it was a holiday. The goal of this unarmed armada was nothing less than reclaiming the small river.
“This is a strategic takeover!” the leader of the ragtag crew, Nati Vaknin, shouted through a bullhorn as he waded ahead of the group.
The flotilla’s destination was a forbidden paradise: an exquisite, aquamarine stretch of the stream that runs through, and that has effectively been monopolized by, Kibbutz Nir David, a communal farm founded by early Zionist pioneers, Ashkenazi Jews from Europe who historically formed the core of the Israeli elite.
Free the Asi campaign, a group fighting for public access to a cherished beauty spot and against perceived privilege. On the other is a kibbutz eager to maintain its hard-earned assets and tranquil lifestyle. The dispute has landed in court, awaiting resolution; in late May, the state of Israel weighed in, backing the public’s right to access the stream through the kibbutz.
But underlying the battle are much greater tensions that extend across Israel.
The Asi dispute pits advantaged scions of the country’s socialist founders against a younger generation from a traditionally marginalized group. And it has resonated across Israel as a distillation of the identity politics and divisions that deepened under the long prime ministership of Benjamin Netanyahu.
Israel’s fourth in two years, 93.5 percent of the vote in Beit Shean, with a population of about 18,000, went to right-wing or religious parties mostly aligned with Mr. Netanyahu, then the prime minister. Three miles away in Nir David, a community of about 650 people, over 90 percent of the votes went to centrist or left-wing parties that belong to the new governing coalition that ousted him.