Source identity and administrative path
The source row behind Ya'an is GeoNames ID 1787816. Its recorded administrative path is Ya'an Shi → Sichuan → China, and GeoNames classifies the place as a second-order administrative seat. Ya'an occurs once as a primary city label in this atlas sample; the numeric ID remains the durable source key if names change. The city row itself was updated 2025-08-19; that date belongs to the source record, not to every transport or visitor detail in the real destination.
Population position inside fixed cohorts
Within the fixed 1,206-record atlas, Ya'an ranks 911 by recorded population. Inside the 296 selected China entries it ranks 254; inside the 632 entries in its broad region it ranks 492. Its 612,056 population value is 0.53 times the 1,165,375 median for the country cohort and 0.61 times the 1,008,426 regional median. Ya'an sits in the lower half of this atlas's selected China entries. Ya'an's recorded value is materially below the country-cohort median used here. These comparisons describe this selected dataset only; they are not current census rankings or official urban-area boundaries.
Nearest-reference pattern
Ya'an's three nearest other atlas coordinates are Meishan at 80.945 km with 1,107,742 recorded people; Leshan at 87.529 km with 662,814 recorded people; Chengdu at 127.446 km with 13,568,357 recorded people. The closest-to-farthest distance spread is 46.501 km. Compared with Meishan, Ya'an's recorded population is 0.55 times as large. Against Ya'an, Meishan follows Meishan Shi → Sichuan → China in the source. Its point has higher latitude and higher longitude; it belongs to the same selected China cohort, uses the shared Asia/Shanghai identifier, and carries the same second-order administrative seat class. Its recorded population is above Ya'an's. Against Ya'an, Leshan follows Leshan Shi → Sichuan → China in the source. Its point has lower latitude and higher longitude; it belongs to the same selected China cohort, uses the shared Asia/Shanghai identifier, and carries populated place rather than second-order administrative seat. Its recorded population is above Ya'an's. Against Ya'an, Chengdu follows Chengdu Shi → Sichuan → China in the source. Its point has higher latitude and higher longitude; it belongs to the same selected China cohort, uses the shared Asia/Shanghai identifier, and carries first-order administrative seat rather than second-order administrative seat. Its recorded population is above Ya'an's. Its nearest-neighbor distance ranks 618 of 1,206 from shortest to longest in the same snapshot. Ya'an's nearest-coordinate gap belongs to the wider half of atlas distances. This pattern can reveal whether other catalog references are geographically close, but it cannot establish whether a border crossing is possible or practical, or whether rail, road, fare, or journey-time connections exist. Read as one record signature, GeoNames 1787816, the coordinate pair 29.9852 / 102.9990, country rank 254 of 296, and neighbor GeoNames 1800818 at 80.945 km bind Ya'an to a reproducible comparison. That combined key distinguishes the row; it is not a recommendation or evidence of a physical connection.
Coordinate, time-zone and class cohorts
Ya'an's reference point is 29.9852° north and 102.9990° east. The IANA identifier Asia/Shanghai is shared by 291 city rows in this catalog, while the GeoNames class PPLA2 is shared by 341 rows. Ya'an's row carries both second- and first-order administrative labels. Ya'an's point falls in the lower-latitude coordinate band used by this atlas's row checks. Ya'an's time-zone field defines the narrower catalog cohort; its place class is shared more broadly. GeoNames supplies no elevation for Ya'an, so the profile preserves that missing value instead of guessing terrain. Together these fields form a reproducible identity check for this page, not a claim about walkability, climate or accessibility.
- Record keys
- Ya'an · GeoNames 1787816 · Q427557
- Name scope
- Ya'an · 1 atlas row share this source label · qualifier not required
- Administrative chain
- Ya'an Shi · Sichuan · China
- Coordinate signature
- 29.9852° N · 102.9990° E
- Population snapshot
- 612,056 · atlas rank 911 of 1,206
- Country comparison
- China rank 254 of 296 · median 1,165,375 · ratio 0.53×
- Regional comparison
- Asia rank 492 of 632 · median 1,008,426 · ratio 0.61×
- Time-zone cohort
- Asia/Shanghai · 291 of 1,206 atlas rows
- Place-class cohort
- PPLA2 second-order administrative seat · 341 of 1,206 rows
- Elevation field
- Ya'an · missing in GeoNames
- Nearest reference
- Meishan · 80.945 km · population 1,107,742 · atlas rank 489
- Second reference
- Leshan · 87.529 km · population 662,814 · atlas rank 835
- Third reference
- Chengdu · 127.446 km · population 13,568,357 · atlas rank 9
- Neighbour geometry
- Ya'an · nearest-distance rank 618 of 1,206 · three-reference spread 46.501 km
- Source dates
- Ya'an row updated 2025-08-19 · atlas dataset checked 2026-08-04