# Sai Yoi Subdistrict, Den Chai, Phrae Province – Villages & Map > Source: https://wherepedia.org/thailand/phrae/den-chai/sai-yoi/ Subdistrict · Den Chai # Sai Yoi Sai Yoi is a subdistrict (tambon) of Thailand in Den Chai, Phrae Province. It covers **237.7 km²**. 8 named villages and localities are recorded here, and 17 mapped services such as hospitals, banks and schools. - 238km² - 17mapped services - 207 mtypical elevation ## Where is Sai Yoi? Sai Yoi lies in [Den Chai](https://wherepedia.org/thailand/phrae/den-chai/), [Phrae Province](https://wherepedia.org/thailand/phrae/), [Thailand](https://wherepedia.org/thailand/). It borders 9 other subdistricts: [Ban Pin](https://wherepedia.org/thailand/phrae/long/ban-pin/), [Den Chai](https://wherepedia.org/thailand/phrae/den-chai/den-chai/), [Huai Rai](https://wherepedia.org/thailand/phrae/den-chai/huai-rai/), [Mae Pan](https://wherepedia.org/thailand/phrae/long/mae-pan/), [Mae Phun](https://wherepedia.org/thailand/uttaradit/laplae/mae-phun/), [Mae Sin](https://wherepedia.org/thailand/sukhothai/si-satchanalai/mae-sin/), [Na Nok Kok](https://wherepedia.org/thailand/uttaradit/laplae/na-nok-kok/), [Na Phun](https://wherepedia.org/thailand/phrae/wang-chin/na-phun/) and [Pong Pa Wai](https://wherepedia.org/thailand/phrae/den-chai/pong-pa-wai/). By area it is the 303rd largest of 7,425 subdistricts in Thailand. It covers 43.8% of [Den Chai](https://wherepedia.org/thailand/phrae/den-chai/). The centre of Sai Yoi is about 464 km in a straight line from Bangkok, the capital. It is about 16 km from Den Chai, the main town of Den Chai. The centre point is at 17.8952° N, 99.9356° E. Local names: ไทรย้อย . Source: [Royal Thai Survey Department via OCHA HDX, administrative boundaries (COD-AB, CC BY-IGO)](https://data.humdata.org/dataset/cod-ab-tha). ## Villages and localities in Sai Yoi Open gazetteers list **8 villages, towns and localities** in Sai Yoi. Settlements here lie between about 155 m and 341 m above sea level (median 207 m). - Ban Bo Kaeo - Ban Dong Ya Thao - Ban Nam Phrao - Ban Pa Phai - Ban Pak Pan - Ban Pang Kho - Ban Sai Yoi - ปากปาน Source: [GeoNames (CC BY 4.0) — settlements, natural and historic features](https://www.geonames.org/); [© OpenStreetMap contributors (ODbL), Geofabrik extract — named settlements](https://www.openstreetmap.org/copyright). ## Landscape and landmarks of Sai Yoi Named natural and historic features inside Sai Yoi, from the GeoNames gazetteer. ### Water 4 reservoirs and tanks; 2 rivers and streams. - Ang Kep Nam Ban Bo Kaeo - Ang Kep Nam Huai Nam Sai - Ang Kep Nam Mon Ton - Ang Kep Nam Pok Kalong - Huai Hok - Huai Sin Sai ### Hills and mountains 9 mountains; 1 hill. - Mon Pha Tai · 698 m - Doi Mae Ranang · 676 m - Doi Mon Pa Kha · 665 m - Mon Suea Rong · 613 m - Doi Hang Sam Kha · 610 m - Doi Kha Rawang · 609 m - Doi Long Kian · 591 m - Mon San Khet · 572 m - Mon Ki So · 566 m - Mon Phan Ma · 397 m Source: [GeoNames (CC BY 4.0) — settlements, natural and historic features](https://www.geonames.org/). Places of worship are not listed. Elevations are from the GeoNames terrain model and are approximate. ## Weather in Sai Yoi and the best time to visit Using the climate of Den Chai, the warmest month is Apr (average 30 °C) and the coolest is Dec (21 °C). About 1,233 mm of rain falls in a year; the wettest month is Aug (234 mm) and the driest Feb (7 mm). The most comfortable months for a visit are **October to March**. - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec Month Average °C Rain mm Jan 22 15 Feb 25 7 Mar 28 29 Apr 30 73 May 28 190 Jun 27 150 Jul 26 169 Aug 26 234 Sep 26 223 Oct 26 109 Nov 24 24 Dec 21 10 Source: [NASA POWER climatology, retrieved 2026-10-29](https://power.larc.nasa.gov/). ## Nearest hospital, bank and fuel from Sai Yoi Need Nearest mapped Distance Hospital โรงพยาบาลส่งเสริมสุขภาพตำบลบ้านบ่อแก้ว · Sai Yoi 4.7 km [Map](https://www.openstreetmap.org/?mlat=17.91555&mlon=99.89626#map=17/17.91555/99.89626) Bank ธกส.สาขาเด่นชัย · Den Chai 15 km [Map](https://www.openstreetmap.org/?mlat=17.98090&mlon=100.04964#map=17/17.98090/100.04964) ATM Krung Thai Bank · Huai Rai 16 km [Map](https://www.openstreetmap.org/?mlat=17.95623&mlon=100.06828#map=17/17.95623/100.06828) Petrol pump Minipump · Sai Yoi 6.2 km [Map](https://www.openstreetmap.org/?mlat=17.94862&mlon=99.92015#map=17/17.94862/99.92015) Hotel เด่นชัยซิตี้ รีสอร์ท · Sai Yoi 6.4 km [Map](https://www.openstreetmap.org/?mlat=17.86375&mlon=99.98657#map=17/17.86375/99.98657) Mall ร้านอรยาไม้สักทอง · Mae Chua 19 km [Map](https://www.openstreetmap.org/?mlat=17.98311&mlon=100.09340#map=17/17.98311/100.09340) School Ban Sai Yoi School · Sai Yoi 11 km [Map](https://www.openstreetmap.org/?mlat=17.97193&mlon=99.99829#map=17/17.97193/99.99829) College วิทยาลัยเกษตรและเทคโนโลยีแพร่ · Den Chai 15 km [Map](https://www.openstreetmap.org/?mlat=17.96240&mlon=100.06100#map=17/17.96240/100.06100) Police station Police Station · Na Phun 7.3 km [Map](https://www.openstreetmap.org/?mlat=17.86385&mlon=99.87520#map=17/17.86385/99.87520) Source: [Overture Maps places (CDLA-Permissive-2.0) and © OpenStreetMap contributors (ODbL)](https://overturemaps.org/). Straight-line distance from the centre of the division, within 40 km. ## Hospitals, banks and other services in Sai Yoi Places mapped inside Sai Yoi in open map data, by type. - Hospitals3 - Petrol pumps1 - Hotels1 - Schools2 - Pharmacies1 - Restaurants9 Source: [Overture Maps places (CDLA-Permissive-2.0) and © OpenStreetMap contributors (ODbL)](https://overturemaps.org/). Coverage depends on what has been mapped; contact details are not shown. ## Other subdistricts in Den Chai - Den Chai - Huai Rai - Mae Chua - Pong Pa Wai ## Quick answers - Where is Sai Yoi?In Den Chai, Phrae Province, Thailand - What borders Sai Yoi?Ban Pin, Den Chai, Huai Rai, Mae Pan, Mae Phun, Mae Sin, Na Nok Kok, Na Phun and Pong Pa Wai - How many villages are in Sai Yoi?8 named settlements (GeoNames, OpenStreetMap) - What is the elevation of Sai Yoi?Settlements lie between 155 m and 341 m - How many reservoirs and tanks are in Sai Yoi?4 named in GeoNames - What is the highest point in Sai Yoi?Mon Pha Tai (698 m, GeoNames elevation model) - What is the best time to visit Sai Yoi?October to March - Where is the nearest hospital to Sai Yoi?โรงพยาบาลส่งเสริมสุขภาพตำบลบ้านบ่อแก้ว, about 4.7 km from the centre - Where is the nearest bank to Sai Yoi?ธกส.สาขาเด่นชัย, about 15 km from the centre - Where is the nearest ATM to Sai Yoi?Krung Thai Bank, about 16 km from the centre - Where is the nearest petrol pump to Sai Yoi?Minipump, about 6.2 km from the centre - How many hospitals are in Sai Yoi?3 mapped - How many petrol pumps are in Sai Yoi?1 mapped - What is the P-code of Sai Yoi?TH540503 (OCHA common operational dataset)