The speaker is on a plane at dusk, looking down at a river and finding it oddly calming. The poem follows what the speaker sees: the river wandering, thinning and widening, splitting around an island and joining up again. The speaker admires how easy it all looks. The river does exactly as it pleases, and the speaker is left thinking about "graceful ease."
The language mirrors the river. Short, playful rhymes like "wander, meander" and "silver sliver" make the lines feel as though they're drifting along, and the uneven line lengths bend like the water. As the light fades, the river turns from a "silver sword" into something lake-like, and then it's gone.
The ending is the quiet surprise. The speaker realizes they never asked the river's name. It's a small, gentle moment that suggests a feeling of loss, or a missed chance to connect with something that kept them company for a while. The mood is peaceful, then a little wistful.