[164] Bhikkhus, when a boundary (sīmā) has not been authorized, has not been established, then whatever village or town [a bhikkhu] dwells in dependence upon — the village boundary of that village, or the town boundary of that town: this, therein, is of common communion (samānasaṃvāsā) and of a single Uposatha (ekuposathā).
If, bhikkhus, [he dwells] in a wilderness where there is no village, then [the area] extending seven abbhantaras all around: this, therein, is of common communion and of a single Uposatha.
Bhikkhus, every river is without a boundary; the entire ocean is without a boundary; every natural lake (jātassara) is without a boundary. In a river, bhikkhus, or in the ocean, or in a natural lake, [the area] all around [within the distance of] a water-splash (udakukkhepa) of a man of medium stature: this, therein, is of common communion and of a single Uposatha.
[Editorial footnote of the Siam Raṭṭha edition:
1. The Burmese edition (M.) reads samānasaṃvāsaṃ ekuposathaṃ.
2. In all the books this formal act of announcement (kammavācā) has come down in just this form; but it appears either deficient or redundant. For therein, if the pair of words "samānasaṃvāsā ekuposathā" qualifies the word "sīmā," it would be deficient in the phrases "saṅgho taṃ sīmaṃ samūhaneyya" and "saṅgho taṃ sīmaṃ samūhanati"; whereas if it is a predicative complement (vikatikamma) to the word "sammatā," it would be redundant in the phrases "yassāyasmato ... samugghāto" and "samūhatā sā ... ekuposathā." It should be adopted only after due consideration. Our own preference is this: "Venerable sirs, let the Saṅgha listen to me. Whatever boundary has been authorized by the Saṅgha as of common communion and of a single Uposatha — if it is opportune for the Saṅgha, let the Saṅgha abolish that boundary. This is the motion. Venerable sirs, let the Saṅgha listen to me. Whatever boundary has been authorized by the Saṅgha as of common communion and of a single Uposatha — the Saṅgha abolishes that boundary. If the abolition of this boundary is agreeable to any venerable one, let him remain silent; he to whom it is not agreeable should speak. That boundary has been abolished by the Saṅgha. It is agreeable to the Saṅgha; therefore it is silent. Thus do I hold it."]
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.