2024 年 10 月 10 日，下雨後幾天，我們去了內洞國家森林遊樂區。碧綠的河水，賞心悅目，氣勢磅礴的瀑布，也給我們留下很深的印象。我們 2025 年 5 月 5 日又再次與朋友結伴同遊。
內洞國家森林遊樂區於 1984 年建立，位於新北市烏來區，海拔在 230~800 公尺之間。區內有南勢溪、內洞溪及烏紗溪。水氣充沛，林相茂密，是蕨類、鳥類、蛙類與昆蟲的樂園。春夏交際，蛙類、蟲類交配季節，大鳴大放的吸引異性，故舊稱「娃娃谷」，乃「哇哇」音變而來。
南勢溪穿梭其中，與內洞溪交會處，受地形變化而呈現三層式的瀑布 ，水量豐沛，水勢奔騰壯闊，這便是遊樂區的主角 - 內洞瀑布 (又名「信賢瀑布」、「娃娃谷瀑布」，當地人或稱「信賢隱瀑」)。
遊樂區設有三條步道系統：觀瀑步道 、森林浴步道與賞景步道。林蔭濃密，遍布天然闊葉林與柳杉，並有多種蕨類植物及昆蟲，四季皆有不同的生態景觀，是北部賞鳥與觀察自然的熱門地點。
We visited Neidong National Forest Recreation Area on October 10, 2024, just a few days after it had rained. The clear, mint-green river was a delight to the eyes, and the majestic waterfalls left a deep impression on us. We returned with friends on May 5, 2025.
Established in 1984, the Neidong National Forest Recreation Area is located in Wulai District, New Taipei City, at an altitude ranging from 230 to 800 meters. The area encompasses the Nanshi, Neidong, and Wusha Rivers. With abundant moisture and dense forests, it is a haven for ferns, birds, frogs, and insects. During the spring and summer mating seasons, frogs and insects hum their songs to attract mates, earning the area its nickname, the "Valley of WaWa." The name is derived from the onomatopoeic sound “wa wa.”
The Nanshi River flows through the area, and at its confluence with the Neidong River, a three-tiered waterfall—formed due to topographical changes—becomes the centerpiece of the area: Neidong Waterfall (also known as "Xinxian Waterfall," "Valley of WaWa Waterfall," and locally as "Xinxian Hidden Waterfall").
The area offers three trail systems: a waterfall viewing trail, a forest bathing trail, and a scenic trail. It is densely shaded, with natural broad-leaved forests and cryptomeria trees, as well as a wide variety of ferns and insects. With distinct ecological landscapes in each season, it is a popular destination for birdwatching and nature observation in northern Taiwan.
烏紗溪瀑布 Wusha Creek Waterfall
在進園區不遠處，順著觀瀑步道走，會看到烏紗溪瀑布。落差約 20 公尺，雖然不是氣勢雄偉, 但清新秀麗。
Not far from the park entrance, follow the waterfall viewing trail and you'll come across Wusha Creek Waterfall. With a drop of about 20 meters, it may not be particularly impressive, but it is refreshingly beautiful.
羅好壩 Luohao Dam
再順著觀瀑步道繼續走，就可到達羅好壩或信賢堰堤，它又稱為拉號壩。「羅好」之名來自泰雅族語「Lahaw」(拉號），是「森林濃密」的意思。羅好壩截取南勢溪的溪水，透過長達 4.7 公里的隧道與阿玉壩的水一同導入烏來發電廠，利用羅好壩與烏來電廠兩地之間約 80 餘公尺的落差進行水力發電。羅好壩為川流式混凝土重力壩，採閘門控制溢流堰方式，台電公司在 1963 年將堰頂加設 4 道溢洪道弧形閘門，以配合尖峰時刻發電。壩長55公尺，壩高12公尺，蓄水量約為30萬立方公尺。
Continuing along the waterfall viewing trail, you will reach Luohao Dam, also known as Xinxian Dam or Lahaw Dam. It is named after the Atayal word Lahaw, meaning “dense forest.” The dam intercepts water from the Nanshi River and channels it—along with water from the Ayu Dam—through a 4.7-kilometer tunnel to the Wulai Power Plant. Hydroelectric power is generated by utilizing the approximately 80-meter drop in elevation between the two locations. Luohao Dam is a stream-type concrete gravity dam with a gate-controlled overflow weir. In 1963, the Taiwan Power Company added four radial spillway gates to the crest of the weir to accommodate peak power generation. The dam is 55 meters long and 12 meters high, with a storage capacity of approximately 300,000 cubic meters.
樂水橋 Leshui Bridge
順著觀瀑步道到樂水橋，就可同時看到多層瀑布。最下層瀑布落差僅 3 公尺，常被人忽視了。
Follow the waterfall viewing trail to Leshui Bridge, where you can view multiple tiers of the waterfall at once. The lowest tier of the waterfall has a drop of just 3 meters and is often overlooked.
內洞瀑布 Neidong Waterfall
從樂水橋再彎回觀瀑步道(全長約 1,170 公尺)，走上斜坡及樓梯，即到觀景平台，先到中層瀑布，落差 19 公尺，氣勢最大。(*註: 許多地圖上，都稱這是下層瀑布。) 再往上爬，則可看到上層瀑布，雖然落差少了些，只有 13 公尺，但氣勢也不弱。
From Leshui Bridge, rejoin the waterfall viewing trail (approximately 1,170 meters in total). Climb the slope and stairs to reach the viewing platform. The middle waterfall— with a drop of 19 meters— is the most impressive. (*Note: Many maps refer to this as the lower waterfall.) If you climb further up, you can see the upper waterfall. Although its 13-meter drop is smaller, it is still quite impressive.
負離子 Negative Ion
內洞瀑布的負離子含量極高。負離子又稱「空氣中的維他命」，藉由植物光合作用、陽光中的紫外線分解空氣離子，以及降雨、瀑布傾瀉、湍急河水引發水分子相互摩擦碰撞等產生。負離子的含量愈高，淨化空氣的效果越好。除此之外，傳統醫學認為負離子還有淨化血液、活化細胞、提升免疫力、調整自律神經等功效。然而，現代醫學並沒有足夠的證據來證實這些說法。
Neidong Waterfall is rich in negative ions. Also known as the "vitamins of the air," negative ions are produced through plant photosynthesis, the breakdown of air molecules by ultraviolet rays from sunlight, and the friction and collision of water molecules caused by rainfall, waterfalls, and rushing rivers. The higher the concentration of negative ions, the greater the air purification effect. Traditional medicine also holds that negative ions can purify the blood, activate cells, boost immunity, and regulate the autonomic nervous system. However, modern medicine lacks sufficient evidence to substantiate these claims.
芬多精 Phytoncidin
芬多精是一種植物（尤其是樹木）的「自衛香氣」，散發出來的揮發性抗菌物質，能抑制空氣中的細菌和黴菌生長。也可避免植物本身腐爛，或被昆蟲、動物所食。功能類似人體免疫系統。每種植物散發出來的芬多精氣味都不相同，可殺死不同的病菌。對人體具有消炎殺菌、去除疲勞、刺激自律神經、安定情緒、預防氣管疾病等功效。
Phytoncides are a type of "self-defense aroma" emitted by plants, especially trees. These volatile antimicrobial substances inhibit the growth of airborne bacteria and mold. They also help prevent the plant from rotting or being eaten by insects and animals. Their function is similar to that of the human immune system. The scent of phytoncides varies from plant to plant, and each species can target different pathogens. Phytoncides have anti-inflammatory and antibacterial properties, relieve fatigue, stimulate the autonomic nervous system, stabilize emotions, and help prevent respiratory diseases.
* 如果以下的油管影片模糊或畫質不佳，可在設置上更改畫質，改成 1080p。
World Through My Eyes (Photographs) Posts/我鏡頭裏的世(視)界帖子
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