四分律刪繁補闕行事鈔 1.125

1.125

若三種作法，隨處限局，不約方隅。若論自然，則有不定：若聚落中，界分可知，隨其分齊，亦無方圓；不可分別，人解不同。

If it is the three kinds of artificial boundaries, they are delimited according to the place and are not restricted to cardinal directions. If discussing natural boundaries, then they are variable: if in a village the boundary divisions are known, they follow its limits and likewise have no fixed square or circular shape; if they cannot be distinguished, people's interpretations differ.