Minecraft wiki entry for Canyon, associated text: In Bedrock Edition the seed 1669320484 generates a huge canyon extending endlessly from southwest to northeast at coordinate X=−1269, Z=0, shaped by countless identical connected north-south canyons. There are other lines of canyons parallel to this one, but few of them are visible aboveground or have the canyons connected. This seed also generates parallel lines of endless dungeons underground.
It is relatively-common to find up to around half a dozen canyons intersecting close even to where they're first found (including vertically, often perpendicularly). So if one finds one, one may find more, soon-enough.