Mangangate River

{{Short description|River in Muntinlupa, Philippines}}

{{Use mdy dates|date=September 2024}}

{{Infobox river

| name = Mangangate River

| name_native =

| name_native_lang =

| name_other = Alabang–Cupang River

| name_etymology =

| image = File:Alabang Festival Mall Water Garden, Muntinlupa City.jpg

| image_size =

| image_caption = Mangangate River flowing through the Water Garden, Festival Alabang

| map =

| map_size =

| map_caption =

| pushpin_map = Luzon mainland#Philippines

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| subdivision_type1 = Country

| subdivision_name1 = Philippines

| subdivision_type2 = Region

| subdivision_name2 = National Capital Region

| subdivision_type3 =

| subdivision_name3 =

| subdivision_type4 = City

| subdivision_name4 = Muntinlupa

| subdivision_type5 =

| subdivision_name5 =

| length = {{convert|10|km|mi|sp=us|abbr=on}}

| width_min =

| width_avg =

| width_max =

| depth_min = {{convert|0.25|m|ft|sp=us}}

| depth_avg =

| depth_max = {{convert|2|m|ft|sp=us}}

| discharge1_location=

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| source1 =

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| source1_elevation = < {{convert|2|m|ft|sp=us|abbr=out}} above sea level

| mouth = western lobe of Laguna de Bay

| mouth_location =

| mouth_coordinates = {{Coord|14.425607|N|121.053151|E|format=dms|dim:15000_region:PH_type:river|display=inline,title}}

| mouth_elevation =

| progression =

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}}

The Mangangate River ({{langx|tl|Ilog Mangangate}}), also referred to as the Alabang–Cupang River, is a river system in Muntinlupa, Philippines. It is one of 21 major tributaries of Laguna de Bay.

The main stream has a total length of {{convert|10|km|sp=us}} and has two branches. The first is connected to the drainage system of Ayala Alabang, while the second is connected with the headwater from the New Bilibid Prison (NBP) Reservation, near Camp Sampaguita. This second branch flows through at Ayala Alabang Village and Filinvest City, and connects with the first branch at the Pasong Diablo site, passes through Festival Supermall until it drains out into Laguna de Bay at a point between Wawa, Alabang and Purok 1, Cupang.

The river system has four adjoining creeks:

• The biggest, at a length of {{convert|3500|m|sp=us}}, joins the river at Pasong Diablo and serves as the Ayala Alabang Village Drainage;
• Two creeks join the mainstream at the Filinvest site; and
• At the NBP Reservation, one creek spans {{convert|800|m|sp=us}}.

The depth of the Mangangate currently varies from {{convert|2|to|0.25|m|ft|sp=us}}.