《古今圖書集成》 has 坑:



On the other hand, a different edition of 《紹興府志》 has ⿰阝京:



Additional evidence would be useful.

▲ [寶慶]會稽續志（明正德刊本）卷4 folio 2a


▲ 諸暨縣志（清乾隆刊本）卷3 folio 15a

The [嘉泰]會稽志 mentions that 《五洩山十題》is included in 《掇英》:

▲ [寶慶]會稽續志（明正德刊本）卷4 folio 2a

《掇英》 should be short for 《會稽掇英總集》, here it gives 源:

▲ 會稽掇英總集（明山陰祁氏淡生堂鈔本）卷4

The baidu 百科 mentions that there is 西源峽谷 in 五洩. And the poem 造化鑿坤維，千巖闕空碧。有時雲雨開，殘陽落幽石 also depicts a valley scene.

Therefore, ⿰阝京 is very likely a misprint of 源. Here 氵 and 丿 combine into 阝 and 京 might be a corrupted form of 亰 (a variant of 原 without 丿). But given that we have multiple ⿰阝京 evidences, I suggest we encode it as-is.

Errata: The reference of figure 3 in the previous comment should be [嘉泰]會稽志（明正德刊本）卷15 folio 41b.

This character is also needed as the personal name character in ROK, which is included in one modern internal system in ROK as U+F1943.