Tree of Tule - Mexico Having the largest trunk of any tree in the world, the Tree of Tule is slightly larger than the Giant Sequoia. The approximate age is estimated between 1200 to 3000 years old and is located in Santa Maria del Tule, Oaxaca, Mexico.
Giant Sequoias [wiki] (Sequoiadendron giganteum), which only grow in Sierra Nevada, California, are the world's biggest trees (in terms of volume). The biggest is General Sherman [wiki] in the Sequoia National Park - one behemoth of a tree at 275 feet m)
This growing-together & melting-into-one-another of tree branches is called “inosculation”, from the Latin osculare, to kiss. An arboreal en-kissing, then, that can make it hard to say where one being ends & another begins.